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In order to meet the ever-increasing demand for high throughput in WiFinetworks, the IEEE 802.11ax (11ax) standard introduces orthogonal frequencydivision multiple access (OFDMA). In this letter, we address thestation-resource unit scheduling problem in downlink OFDMA of 11ax subject tominimum throughput requirements. To deal with the infeasible instances of theconstrained problem, we propose a novel scheduling policy based on weightedmax-min fairness, which maximizes the minimum fraction between the achievableand minimum required throughputs. Thus, the proposed policy has a well-definedbehavior even when the throughput constraints cannot be fulfilled. Numericalresults showcase the merits of our approach over the popular proportionalfairness and constrained sum-rate maximization strategies.

A Scheduling Policy for Downlink OFDMA in IEEE 802.11ax with Throughput Constraints